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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance, $ (866) $ 178
Realized and unrealized gains (losses):    
Included in regulatory assets (2,874) 0
Included in regulatory liability 0 6,600
Included in other comprehensive income 0 0
Included in earnings [1] (4,671) 855
Included in current assets 0 73
Purchases 0 7,026
Sales 0 0
Issuances 0 0
Settlements 4,671 (7,953)
Ending balance, $ (3,740) $ 6,779
[1] MGE's exchange-traded derivative contracts, over-the-counter party transactions, purchased power agreement, and FTRs are subject to regulatory deferral. These derivatives are therefore marked to fair value and are offset in the financial statements with a corresponding regulatory asset or liability.